Reservoir Description On The 1^st-3^rd Sandstone Beds Of The Second Member In The Shahejie Formation Of The Tuo 28 Block In Shengtuo Oilfield

The 1^st-3^rd sandstone beds in the second member of the Shahejie formation of the Tuo 28Block began to be developed in 1964.It has gone through the development period of elastic drive,water injection development,encryption well network expansion,subdivision of reservoir development period and high water cut development period.The well pattern has been adjusted three times for the purpose of improving development effect.At present,the comprehensive water content of the unit is 98.1%.It has been in the late stage of super high water cut development.Development contradictions become increasingly prominent.In order to improve the development effect of reservoir.Reservoir description on the 1st-3rd sandstone beds in the second member of the Shahejie formation of the Tuo 28 block has been carried out.Geological,seismic,logging and reservoir dynamic and static data has been used to carry out the reservoir description on the 1st-3rd sandstone beds of the second member in the Shahejie formation of the Tuo 28 Block.The top and bottom of the target layer section were divided according to the two relatively stable standard layers.The subzones were divided by the means of the cycle contrast and hierarchical control to the whole area.Besides,the tiny structure was studied with the results of strtigraphic correlation.Based on the data of drilling core,well logging and 3D seismic interpretation,sedimentary environment and provenance of the area are determined.The heterogeneity of the reservoir are analyzed and studied.The 3D reservoir model was built.It shows that the 1^st-3^rd sandstone beds were divided into 13 layers.Tectonic characteristics of the research area show the typical northeast is highter than southwest.The shape of the area like a dustpan opening to the west.The tiny structure types in the area have four types including small ridge,sunken structure,convex structure,and ditch.There is a close relationship between the tiny structure and distribution of remaining oil.Braided river is the major depositional system which concludes channel filling,channel sand bar,river edge and interfluvial lowlands microfacies.The research shows that the heterogeneity of in-layer is weak,the interlayer is strong.It reflects that the small layers of inner contradiction is more outstanding.The 3D reservoir model was built on the basis of the above study.It conform to the actual geological conditions,which can be directly used for reservoir numerical simulation.This research has significant guiding role to the further development.